Bolt anchor



H. W. PLEISTER.

BOLT ANCHOR. APPLICATION FILED SEPT. 23, 1921.

Patented Sept. 19, 1922.

Patented Sept. 19, 1922.

HENRY W. PLEISTER, OF WESTFIELD, NEW JERSEY, ASSIGNOR TO HENRY NEWHALII.

BOLT ANCHOR.

Application filed. September 23, 1921. Serial No. 502,765.

To all whom it may concern:

Be it known that I, HENRY W. PLnIs'rER, a citizen of the United States,residing at Westfield, in the county of Union and State of New Jersey,have made certain new and useful Improvements in; Bolt Anchors, of whichthe following is a specification taken in connection with theaccompanying drawings.

My invention relates to bolt anchors or expansion bolts, and moreparticularly to what is known in the trade as machine expansions.

My invention relates more particularly to forming the shell or shells ofthe expansion from rolled pressed steel of minimum thickness for theparticular size expansion.

My invention further relates to using this pressed steel shell or shellsin combination with the ordinary malleable iron nut and collar, orpreferably in combination with a steel nut, or steel collar,'or both, myinven tion comprising any combination of these different elements as setforth in the claims.

My invention further relates to certain combinations, sub-combinations,articles of manfacture, and details of constructions all of which willbe more fully hereinafter described and pointed out'in the claims.

In the drawings I have shown different embodiments of my invention butit is of course to be understood that my invention is not to be confinedto the embodiments shown by way of illustration.

Fig. 1 is a vertical section showing my pressed steel shell used incombination with a malleable iron collar and malleable iron nut;

Fig. 2 is a view similar to Fig. 1 but showing the parts after they havebeen expanded within the wall or other suitable support;

Fig. 3 is a vertical sect-ion on the line 3-3 of Fig. 1;

Fig. 4 is a planview of the blank from which the different units to beformed into shells are stamped,

Fig. 5 is a cross-section of the blank on the line 55 of Fig. 4;

Fig. 6 is a perspective view of one of the units after being bent orshaped to form a substantially semicircular shell;

Fig. 7 is a side elevation of the malleable iron nut shown in Fig. 1;

Fig. 8 is a rear elevation of the nut;

Fig. 9 is a form of nut; c Fig. 10 is an'end elevation of the nut shownin Fig. 9; I y

Fig. 11 is a vertical section of a steel co'llar, similar to the'steelnut of Fig. 9,. ex-. cept that it. is not threaded.

Expansion bolts and more particularly vertical section of a modifiedmachine expansion bolts are now commonly made from castings of malleableiron. There are many objections, however, in manufacturing them in thismanner.) The cost is relatively high for there are limits in thethinness of the walls that can be cast from malleable iron so that theresulting castmg is heavier than necessary in place where thickness isnot required. Moreover in the ordinary manufacture of machine expansionsformed of malleable iron castings, there is a large waste from warpingof the castings, mis-runs, too thin castings, sand holes, blow-holes,rough surfaces, fins, and other deformatives. Also considerable grindinghas to be done in removingsp'rews from i the malleable lron castings,all of which add greatly to the expense-of manufacture. By my inventionI avoid all this waste and expense, obviate grinding and rejections ordiscards by forming a finished uniform product which can be turned outfrom the press without any further work except in connection with thepressed steel nuts, when used, which have to be screwthreaded. Theresulting product by my method takes only the minimum amount of metalfor the re-v expansion to be manufactured. This blank is fed through apunch press which punches out the arrow heads 3, 3 leaving arrow headrecesses 14, 14, and cuts the units 4, 4 on the lines 5, 5 each blankforming the plurality of units. Preferably, though not necessarily,

the blank is provided during the rolling with the grooves 6', 6 toreceive the split' spring rings 8, 8. The units 4, 4 are then fed to aforming die which will roll each unit into a semi-cylindrical shell 7,shown in Fig. 6. In the form of my invention as illustrated two of theseshells 7 are employed and preferably, though not necessarily, securedtogether by means of the spring rings 8, 8. y i

The bevels 2, 2 form the inclined surfaces 2, 2 Within the interior ofthe shell 7 I may use any suitable means to expand the shells 7, 7 Imay, for example, as shown in Figs. 1 and 2, employ a nut 9 of malleableiron and a malleable iron collar 10, each being provided with the arrowheads 11, 11.

- The work 121 to be supported is brought adjacent to the collar 10 andthe machine bolt 12 is passed through the work, the unthreaded collar 10and into the threaded nut 9. By turning the head 13 of the bolt 12 themalleable iron collar 10 and the malleablerecesses 14, 1 1, half of eacharrow head recess being formed on each steel shell. When fully expandedthe shells 7, 7 are parallel and the parts are as shown in Fig. 2. Inthis form of my invention I use, as previously noted, the pressed steelshells and the malleable iron nut and collar.

Preferably, however, I use with my pressed steel shells 7, 7 a pressedsteel nut 15, Fig. 9, formed of steel tubing of the required diameterfor the particular size expansion. One end is expanded, in any suit ablemanner, to form a frustum of a cone 16. The unexpanded portion 17 isprovided with screw-threads to cooperate with the screwthreads on thenut 12. Preferably, though not necessarily, I provide my steel nut withlugs 18, 18 formed by cutting a portion of the unexpanded portion 17 ofthe nut and bending up the cut portion as shown in Fig. 9. These lugs18, 18 cooperate with the arrow head slots 14;, 14 in the steel shells7, 7.

' I may use in my expansion bolt the steel shells 7 7 with the steel nut15 and the malleable iron collar 10; preferably I employ with the steelnut 15 a steel collar 19, Fig. 11, having the unexpanded portion 20, theexpanded portion 21, and the lugs 22, 22 similar to the nut 15 exceptthat it is not screw-threaded, so that the threads on the bolt 12 passfreely through it the same they do through the unthreaded malleable ironcollar 10.

Having thus described this invention in connection with illustrativeembodiments thereof, to the details of which I do not desire to belimited, what is claimed as new and what is desired to secure by LettersPatent is set forth in the appended claims.

lVhat I claim is 1. A new article of manufacture for an expansion boltcomprising a steel tubular nut expanded at one end to form a trust-um ofa cone and provided with screw-threads and with a lug on its unexpandedportion.

2. A new article of manufacture for an expansion bolt comprising a steeltubular collar expanded at-one end to form a frustum of a cone andprovided with a lug on its unexpanded portion.

HENRY IV. PLEISTER.

Witnesses MARY R. RYAN, ELIZABETH J. ROTH.

